Cylinder mold for paper-making machines



June 15 1926. 1,589,119

w. s. CRANDELL CYLINDER MOLD FOR PAPER MAKING MACHINES Filed July 10, 1922 INVENTOR 0% f mqaz ATTORNEY Patented June, 15,1926.

UNITED STATES,

1,589,119 PATENT OFFICE.

CBANDELL, OI ELSMERE, NEW YORK.

GYLINDEB HOLD FOB runes-name MACHINES.

Application 'filedluiy 10,

This invention relates to paper making machines in which there is employed a cylindrical mold on which the paper is formed,

said-,cylindrical mold acting with a couch roll carrying afelt for carrying of! the paper formed on the cylindrical mold and for driving the elements and it has more. articularly reference to the construction 0 the cylindrical mold itself, I

In the art as heretofore practiced it has been the custom to build up cylindrical molds of this character by mounting on a central shaft a series of collars or rings in endwise engagement with each other, said rings carrying spiders, these spiders being connected. by means of longitudinally extending barsor rods that are secured to'all the spiders at the peripheries thereof; and it has been the custom to have a ring and a spider say, at ev'e five inches throughout the length of the cyhndrical mold. Usually,

the spiders are recessed at their peripheries and brass rods or bars are laid in these recesses and are secured to such spiders as by soldering or other wise, said ongitudinal "bars or rods in connection with a coarse winding wire, say fourteen to twenty mesh,

forming the underface of the mold. Over the under faceor supporting structure thus formed, is placed the usual forming face 1 consisting of wire screens of relativel fine mesh, say from sixty to one hundre fine.

I It will-be understood that considerable work is necessary to assemble the parts into a structure of the character indicated and also that it is extremely diflicult to maintain a true forming surface, the. result being that waterdoes not pass through from the outer surface to the interior of the cylindrical mold with a requisite degree of pressure with the I consequence that particles of the stock will adhere and build up on the surface thereof,

thereb causing a tear or other uneveness or inequ ties in the paper produced. The object of this invention is to cure the above enumerated defects so that the machine may be operated at a greatly increased while at the same time producing more perfeet, paper. r2

The invention consists primarily in making the jcylindrical structure as an integral mmlfiri, capable of of the passager of the water from. its exterior to its interior in thepropermanner, the structure being so arranged that the so-called under face forms a part of the cylinder itself, the

1922.1 Serial no. 573,961.

shaft, the numerous rings and the spiders being omitted. In this manner, the cost of manufacture is considerably lowered, the speed of the machine is increased, and the pa r produced is more perfect.

n the accompanying drawm the invention' is disclosed in a'concrete and preferred form in which Fig. 1 is a central long-igudinal section of the mold on the plane of e 1- 1 of Fig. 3; Fig. 2" is an endrelevation of the cylinder looking in the direction of arrow 2 of Fig.

of the cy 'nder to the other, and as will be noted, they are. really ribs or vanes projectinwardly from the cylindrical portion. 4 indicates circumferential openings in this cylindrical portion that may be in the form of concentric openings, if so desired, but

which are here shown as being in the form of a spiral. Preferably, these openings ex-- tend art way intothe longitudinal bars 3, as in 'cated at 5, in order to facilitate the passage of the 'waterthrough the surface of the cylinder and so as not to form an obstruction on which the stock may lodges Preferabl the'bars 3are in the form of non-radia vanes whereby they act as baflie plates to rcvent the water in the, interior of the cy dricalmold from reacting outwardly. The spiral thread 8 which is thus formed may have straight vertical faces or may be tapered outwardly and, if desired, be slightly rounded at the top. Surrounding the cylindrical ortion is the usual forming faoemdicated ere by coarse wire mesh 6 and superimposed finer; wire mesh 7. It will be evident that by this construction the cylindrical mold is of unusually simple formation and can be machined true so as to present a better surface for supporting the forming faceof the mold and permits more thorough washing by showers, all of whicli tends to permit of the production of more perfect paper and of a greatly increased speed of manufacture.

I claim:

1. An integrally formed cylinder mold for paper making machines, comprising end heads, a hollow cylindrical portion, longitudinal barsv extending between the end heads and integrally connected with the latter .and with the inside of the cylindrical portion, said cylindrical portion having circumferential openings in its surface.

2. An integrally formed cylinder mold for paper making machines, comprising end heads, a hollow cylindrical portion, longitudinal bars extending between the end heads and integrally connected with the latter and with the inside of the cylindrical portion, said cylindrical portion having circumferential openings arranged in the form of a spiral in its surface.

3. An integrally formed cylinder mold for paper making machines, comprising end heads, a hollow cylindrical portion, longitudinal bars extending between the end heads and integrally connected with the latter and with the inside of the cylindrical portion, said cylindrical portion having circumferential openings in its surface, the

openings extending partly into the longitudinal bars aforesaid.

4. An integrally formed cylinder mold for paper making machines, comprising end heads, a. hollow cylindrical portion, longitudinal bars extending between the end heads and integrally connected with the latter and with theinside of the cylindrical portion, said cylindrical portion having circumferential openings arranged in the form of a spiral in its surface, the openings extending partly into the longitudinal bars aforesaid.

5, An integrally formed cylinder mold for paper making machines comprising, end heads, a hollow cylindrical portion, nonradial longitudinal bars extending between the end heads and integrally connected with the latter and with the insiderof the cylindrical portion, said cylindrical portion having circumferential openings in its surface, the openings extending partly into the longitudinal bars aforesaid.

Signed at New York city in the borough of Manhattan, county and State of New York, this 7 day of July, 1922.

WILLIS s. CRANDELL. 

